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Title: Documentation on limitations and applicabilities of the use of off-the-shelf groundwater models in site cleanup
Authors: Information Technology Laboratory (U.S.)
Installation Restoration Research Program (U.S.)
Ruiz, Carlos E.
Zakikhani, Mansour, 1954-
McGrath, Christian J.
Deliman, Patrick N.
Howington, Stacy E.
Evans, Robert A.
Tracy, Fred T.
Keywords: Groundwater
Unsaturated flow
Multiphase flow
Water quality
Model evaluation
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: The U.S. Army Engineer Waterways Experiment Station Groundwater Modeling Team performed a broad review of available groundwater models and an assessment of Army modeling. The first step was a model screening based primarily on current and anticipated Army and Department of Defense needs, followed by a more rigorous evaluation. This report provides the initial evaluation of more than 12 groundwater models that were selected based on the screening criteria. The effort included scrutiny of the code structure, certain process formulation, and performance evaluation relative to appropriate problems for which analytical solutions are available and/or hypothetical scenarios. Four classes of models were evaluated: (1) saturated flow and/or transport, (2) coupled unsaturate/saturated flow and/or transport, (3) unsaturated flow and/or transport, and (4) multiphase models. Model performance in the initial evaluation was acceptable for the suite of models. The second step was to evaluate/compare the models against analytic solutions, hypothetical scenarios, and/or filed data. Class (1) models were evaluated against analytic solutions for a line and point source in a homogeneous aquifer and against a hypothetical scenario. Results were adequate, although several models exhibit some discrepancies against the analytical solution. Class (2) models were evaluated against field data from a two-dimensional infiltration experiment. Simulation results were mixed; some models were able to simulate the behavior from the experimental data while others were only able to simulate the pattern, but not the full behavior. The results show that models or descriptors for pressure/saturation and hydraulic conductivity/saturation curves are very important in simulating unsaturated saturated flow. Class (3) and (4) models were only evaluated against the example problems since a complete data set for either class was extremely hard to find.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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